Polyimide copolymer, polyimide copolymer resin molded products and their preparation
AssigneeDuPont-Toray Co. Ltd.
InventorsKouichi Sawasaki, Michihiro Kubo, Toshikazu Matsuda
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Abstract
A polyimide copolymer containing a block polyimide polymer component composed of a rigid aromatic diamine compound and an aromatic tetracarboxylic acid compound and a random polyimide copolymer component composed of a flexible aromatic diamine compound and at least two types of aromatic tetracarboxylic acid compounds is prepared by a two-stage polymerization process. Resin molded products prepared from the polyimide copolymer have high modulus, low thermal expansion and low water absorption and can be used as TAB base films that require higher processability and precision.
Claims18
A polyimide copolymer comprising a block polyimide component formed from a rigid aromatic diamine compound and an aromatic tetracarboxylic acid compound and a random polyimide component formed from a flexible aromatic diamine compound and at least two different aromatic tetracarboxylic acid compounds, wherein the rigid aromatic diamine compound comprises from 12 mole % to 30 mole % of the total aromatic diamine compound and wherein the flexible aromatic diamine compound comprises from 70 mole % to 88 mole % of the total aromatic diamine compound.
A process for preparing a polyimide copolymer comprising (1) mixing a rigid aromatic diamine compound and an aromatic tetracarboxylic acid compound in an organic solvent that is nonrecactive to the reactants so that the ratio of the aromatic tetracarboxylic acid compound to the rigid aromatic diamine compound is from 90 mole % to not more than 100 mole %;
- (2) adding a flexible aromatic diamine compound;
- (3) adding an aromatic tetracarboxylic acid compound (A) and a aromatic tetracarboxylic acid compound (B;
- A.noteq.B) in such a quantity that the total aromatic tetracarboxylic acid component and the total aromatic diamine component are equimolar and stirring for a time necessary for completion of the reaction;
- and (4) cyclizing and removing the solvent from the polyamide acid copolymer solution.
A polyimide copolymer resin molded product prepared by molding a polyimide copolymer comprising a block polyimide component comprising a rigid aromatic diamine compound and an aromatic tetracarboxylic acid compound and a random polyimide copolymer component comprising a flexible aromatic diamine compound and at least two different aromatic tetracarboxylic acid compounds.
A process for preparing a polyimide copolymer resin molded product comprising (1) mixing a rigid aromatic diamine compound and an aromatic tetracarboxylic acid compound in an organic solvent that is nonreactive to the reactants so that the ratio of aromatic tetracarboxylic acid compound to the rigid aromatic diamine compound is from 90 mole % to not more than 100 mole %;
- (2) adding a flexible aromatic diamine compound;
- (3) adding an aromatic tetracarboxylic acid compound (A) and adding an aromatic tetracarboxylic acid compound (B;
- A.noteq.B) in such a quantity that the total aromatic tetracarboxylic acid component and total aromatic diamine component are equimolar and stirring for a time necessary for completion of the reaction;
- and (4) cyclizing and removing the solvent after molding the polyamide acid copolymer solution.
Dependencies are inferred from the claim text.